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restore.go
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restore.go
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package watcher
import (
"github.com/ayhanozemre/fs-shadow/event"
"github.com/ayhanozemre/fs-shadow/filenode"
)
func CreateFileNodeWithTransactions(tbl [][]byte) (*filenode.FileNode, error) {
var err error
var root *filenode.FileNode
uuidTable := make(map[string]*filenode.FileNode)
for i := 0; i < len(tbl); i++ {
txn := EventTransaction{}
err = txn.Decode(tbl[i])
if err != nil {
return nil, err
}
node := txn.toFileNode()
if node.ParentUUID == "" {
root = node
}
switch txn.Type {
case event.Create:
uuidTable[node.UUID] = node
if parent, ok := uuidTable[node.ParentUUID]; ok {
parent.Subs = append(parent.Subs, node)
}
case event.Rename:
currentNode := uuidTable[node.UUID]
currentNode.Name = node.Name
currentNode.Meta = node.Meta
case event.Move:
currentNode := uuidTable[node.UUID]
_, _ = root.RemoveByUUID(currentNode.UUID, currentNode.ParentUUID)
if parent, ok := uuidTable[node.ParentUUID]; ok {
currentNode.ParentUUID = node.ParentUUID
parent.Subs = append(parent.Subs, currentNode)
}
case event.Remove:
delete(uuidTable, node.UUID)
_, _ = root.RemoveByUUID(node.UUID, node.ParentUUID)
}
}
return root, nil
}
func RestoreWatcherWithTransactions(tbl [][]byte, tw Watcher) error {
tree, err := CreateFileNodeWithTransactions(tbl)
if err != nil {
return err
}
tw.Restore(tree)
return nil
}